Systems and methods for intra-block copy

Abstract

Techniques and systems are provided for encoding and decoding video data. For example, a method of encoding video data includes obtaining video data at an encoder, and determining to perform intra-picture prediction on the video data, using intra-block copy prediction, to generate the plurality of encoded video pictures. The method also includes performing the intra-picture prediction on the video data using the intra-block copy prediction, and, in response to determining to perform the intra-picture prediction on the video data using the intra-block copy prediction, disabling at least one of inter-picture bi-prediction or inter-picture uni-prediction for the plurality of encoded video pictures. The method also includes generating the plurality of encoded video pictures based on the received video data according to the performed intra-block copy prediction.

What is claimed is: 
     
       1. A method of encoding video data to generate one or more encoded video pictures, the method comprising:
 obtaining video data at an encoder, the video data including a plurality of pictures; 
 determining that inter-picture prediction is enabled for a picture from the plurality of pictures; 
 determining that intra-block copy is enabled as an intra-picture prediction mode for the picture; 
 disabling, in response to determining that intra-block copy is enabled for the picture, bi-prediction as an inter-picture prediction mode for the picture; 
 determining to use intra-block copy to perform intra-picture prediction for a block from the picture to generate the one or more encoded video pictures; 
 determining a set of reference blocks from previously encoded blocks from the picture, wherein the set of reference blocks are determined for performing intra-block copy prediction, and wherein the set of reference blocks do not include reference blocks predicted with bi-prediction due to disabling of bi-prediction for the picture; 
 selecting a reference block from the set of reference blocks; 
 performing intra-block copy prediction with the reference block to generate a prediction unit; and 
 generating the one or more encoded video pictures using the prediction unit. 
 
     
     
       2. The method of  claim 1 , further comprising performing inter-picture uni-prediction on the video data to generate a plurality of P prediction units. 
     
     
       3. The method of  claim 1 , further comprising:
 determining a prediction unit size, wherein disabling bi-prediction is additionally in response to a combination of both: determining to perform the intra-picture prediction on the video data using the intra-block copy prediction and the prediction unit size being less than a threshold. 
 
     
     
       4. The method of  claim 1 , further comprising:
 determining a prediction unit size; and 
 determining that adaptive motion vector resolution (AMVR) is disabled, wherein disabling bi-prediction is additionally in response to determining that the prediction unit size is less than a threshold and determining that AMVR is disabled. 
 
     
     
       5. The method of  claim 4 , wherein disabling bi-prediction is further based on the bi-prediction resulting in at least one of different reference units or different motion vectors. 
     
     
       6. The method of  claim 1 , wherein disabling of bi-prediction is indicated in using a parameter that is included with the one or more encoded video pictures. 
     
     
       7. The method of  claim 6 , wherein the parameter further indicates a portion of the video data to which the disabling applies. 
     
     
       8. An apparatus for encoding video data, the apparatus comprising:
 a memory configured to store video data, the video data including a plurality of pictures; and 
 a processor configured to:
 determine that inter-picture prediction is enabled for a picture from the plurality of pictures; 
 determine that intra-block copy is enabled as an intra-picture prediction mode for the picture; 
 disable, in response to determining that intra-block copy is enabled for the picture, bi-prediction as an inter-picture prediction mode for the picture; 
 determine to use intra-block copy prediction to perform intra-picture prediction for a block from the picture to generate one or more encoded video pictures; 
 determine a set of reference blocks from previously encoded blocks from the picture, wherein the set of reference blocks are determined for performing the intra-block copy prediction, and wherein the set of reference blocks do not include reference blocks predicted with bi-prediction due to disabling of bi-prediction for the picture; 
 select a reference block from the set of reference blocks; 
 perform the intra-block copy prediction with the reference block to generate a prediction unit; and 
 generate the one or more encoded video pictures using the prediction unit. 
 
 
     
     
       9. The apparatus of  claim 8 , wherein the processor is further configured to determine:
 a prediction unit size, wherein disabling bi-prediction is additionally in response to determining that the prediction unit size is less than a threshold. 
 
     
     
       10. The apparatus of  claim 8 , wherein the processor is further configured to:
 determine a prediction unit size; and 
 determine that adaptive motion vector resolution (AMVR) is disabled, wherein disabling bi-prediction is additionally in response to determining that the prediction unit size is less than a threshold and determining that AMVR is disabled. 
 
     
     
       11. The apparatus of  claim 10 , wherein disabling bi-prediction is further based on the bi-prediction resulting in at least one of different reference units or different motion vectors. 
     
     
       12. The apparatus of  claim 8 , wherein disabling of bi-prediction is indicated in using a parameter that is included with the one or more encoded video pictures. 
     
     
       13. The apparatus of  claim 12 , wherein the parameter further indicates a portion of the video data to which the disabling applies. 
     
     
       14. A method of decoding video data to generate one or more decoded video pictures, the method comprising:
 receiving, in a video bitstream, encoded video data, wherein the encoded video data includes a plurality of pictures, and wherein the encoded video data is encoded using a plurality of prediction modes, the plurality of prediction modes including an inter-picture uni-prediction mode, an inter-picture bi-prediction mode, and an intra-picture intra-block copy mode; 
 determining, using data provided in the video bitstream, that bi-prediction is disabled as an inter-picture prediction mode for a picture from the plurality of pictures, wherein bi-prediction is disabled in response to intra-block copy mode being enabled for the picture; 
 determining, using syntax elements in the video bitstream, that a block from the picture was predicted using intra-block copy mode; 
 determining, from the syntax elements, a reference block from among previously decoded blocks of the picture, wherein the reference block was not predicted using bi-prediction due to bi-prediction being disabled for the picture; and 
 reconstructing the block from the reference block based on the block having been predicted using intra-block copy mode. 
 
     
     
       15. The method of  claim 14 , wherein the data provided in the video bitstream includes a parameter that indicates that bi-prediction is disabled. 
     
     
       16. The method of  claim 14 , wherein the video bitstream further indicates a portion of the encoded video data to which disabling of bi-prediction applies. 
     
     
       17. An apparatus for decoding video data, the apparatus comprising:
 a memory configured to store encoded video data received in a video bitstream, wherein the encoded video data includes a plurality of pictures, and wherein the encoded video data is encoded with a plurality of prediction modes, the plurality of prediction modes including an inter-picture uni-prediction mode, an inter-picture bi-prediction mode, and an intra-picture intra-block copy mode; and 
 a processor configured to:
 determine, using data provided in the video bitstream, that bi-prediction is disabled as an inter-picture prediction mode for a picture from the plurality of pictures, wherein bi-prediction is disabled in response to intra-block copy mode being enabled for the picture 
 determine, using syntax elements in the video bitstream, that a block from the picture was predicted using intra-block copy mode; 
 determine, from the syntax elements, a reference block from among previously decoded blocks of the picture, wherein the reference block was not predicted using bi-prediction due to bi-prediction being disabled for the picture; and 
 reconstruct the block from the reference block based on the block having been predicted using intra-block copy mode. 
 
 
     
     
       18. The apparatus of  claim 17 , wherein the data provided in the video bitstream includes a parameter that indicates that bi-prediction is disabled. 
     
     
       19. The apparatus of  claim 17 , wherein the video bitstream further indicates a portion of the encoded video data to which disabling of bi-prediction applies.